◎ 题干
The house is dirty because it ________ since they moved out.
A.doesn't clean B.isn't cleaned
C.hasn't cleaned D.hasn't been cleaned
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“ The house is dirty because it ________ since they moved out.A.doesn't cleanB.isn't cleanedC.hasn't cleanedD.hasn't been cleaned…”主要考查了你对  【现在完成时】【现在完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。